Home
Class 12
CHEMISTRY
Buffer capacity of acidic buffer solutio...

Buffer capacity of acidic buffer solution is maximum when
(1) `P^(H)=P^(k)` (2) [salt ]= [acid ] (3) `p^(K)=7` (4) `[H^(+)]=P^(k)`

A

All are correct

B

(2).(3).(4) are correct

C

(1) and (2) are correct

D

(3) and (2) are correct

Text Solution

AI Generated Solution

The correct Answer is:
To determine the condition under which the buffer capacity of an acidic buffer solution is maximum, we can analyze the provided options step by step. ### Step-by-Step Solution: 1. **Understanding Buffer Capacity**: - Buffer capacity is the ability of a buffer solution to resist changes in pH upon the addition of small amounts of strong acid or base. It is defined as the amount of strong acid or base (in gram equivalents) that can be added to one liter of the buffer solution to change its pH by one unit. 2. **Factors Affecting Buffer Capacity**: - Buffer capacity depends on two main factors: - The ratio of the concentration of the salt (conjugate base) to the concentration of the acid. - The total concentration of the buffer components (acid and salt). 3. **Analyzing Each Option**: - **Option 1: \( pH = pK_a \)**: - This condition implies that the concentration of the acid and its conjugate base are equal, which is when the buffer capacity is at its maximum. This is because the Henderson-Hasselbalch equation states that when [A^-] = [HA], \( pH = pK_a \). - **Option 2: [Salt] = [Acid]**: - This is essentially the same condition as Option 1. When the concentrations of the salt and acid are equal, the buffer capacity is maximized. - **Option 3: \( pK_a = 7 \)**: - This condition does not necessarily relate to buffer capacity. The value of \( pK_a \) indicates the strength of the acid but does not determine the buffer capacity directly. - **Option 4: [H^+] = \( pK_a \)**: - This condition is not relevant to buffer capacity. The concentration of hydrogen ions does not directly indicate the buffer capacity. 4. **Conclusion**: - The buffer capacity of an acidic buffer solution is maximum when the ratio of salt to acid is 1:1, which corresponds to options 1 and 2. Thus, the correct answer is that the buffer capacity is maximum when \( pH = pK_a \) and [Salt] = [Acid]. ### Final Answer: The buffer capacity of an acidic buffer solution is maximum when: - (1) \( pH = pK_a \) - (2) [Salt] = [Acid]
Promotional Banner

Similar Questions

Explore conceptually related problems

The buffering action of an acidic buffer is maximum when its pH equals to

In an acidic buffer solution, if some H_(2)So_(4) is added, its pH will

Higher the amount of acid or base used to produce a definite change of pH in a buffer solution,higher will be its buffer capacity. Buffer capacity of solution is maximum under the following conditions: [Salt]= [Acid] (in acid buffer), [Salt] = [Base] (in base buffer) pH of a buffer solution lies in the range given below: pH = pK_(a)pm1 , In other words, any buffer solution can be used as buffer up to two pH units only, depending upon the value of pK_(a) , or pK_(b), . A buffer is said to be efficient when pH =pK_(a) , or pOH= pK_(b) The bulfer capacity is equal to :

pH of an acidic buffer solution is 5.74 and Pka (CH_3COOH) = 4.74 then the ratio of [Salt]/[Acid] will be

Higher the amount of acid or base used to produce a definite change of pH in a buffer solution,higher will be its buffer capacity. Buffer capacity of solution is maximum under the following conditions: [Salt= [Acid] (in acid buffer), [Salt] = [Base] (in base buffer) pH of a buffer solution lies in the range given below: pH = pk_(a)pm1 , In other words, any buffer solution can be used as buffer up to two pH units only, depending upon the value of pK_(a) , or pK_(b) ,. A buffer is said to be efficient when pH_(a) =pK_(a) , or pOH= pk_(b) Which among the following solution will be the most efficient buffer?

Solution of a weak acid and its anion (that is,its conjugate base) or of a base and its common cation are buffered. When we add a small amount of acid or base to any one of the, the pH of solution change very little. pH of buffer solution can be computed as for acidic buffer : pH=pK_(a)+ log.(["Conjugate base"])/(["Acid"]) for basic buffer : pOH=pK_(b)+log.(["Conjugate acid"])/([Base]) It is generly accepted that a has useful buffer cpacity (pH change resisting power) provided that the value of [salt or conjugate base] /[acid] for acidic buffer lies within the range of 1 : 10 to 1. Buffer capacity is maximum when [conjugate base] = [acid] Useful correct statement :

Useful buffer range of weak acid HA(K_(a)=10^(-5)) is :

When small amount of an acid or alkali is mixed with a buffer solution, then pH of buffer solution

Hin is an acidic indicator (K_(Ind) =10^(-7)) which dissociates into aqueous acidic solution of 30mL of 0.05M H_(3)PO_(4) (K_(1) = 10^(-3), K_(2) = 10^(-7), K_(3) = 10^(-13)) If Hin and Ind^(Theta) posses colour P and Q , respectively, and concentration of HIn is 120 times than that of Ind^(Theta) . colour Q predominates over P when concnetration of Ind^(Theta) is 127 times of HIn . What is the pH range of the indicator.

The oxo-acids of P_(2)O_(5) is H_(3)PO_(4)